Sony SPP-904 Service Manual
SPP-904
SERVICE MANUAL
SPECIFICATIONS
E Model
MICROFILM
CORDLESS TELEPHONE
TABLE OF CONTENTS
1. GENERAL
Setting Up the Phone ...................................................... 3
Making and Receiving Calls........................................... 3
2. DISASSEMBLY ......................................................... 5
3. TEST MODE.............................................................. 7
4. ELECTRICAL ADJUSTMENTS
Base Unit ......................................................................... 10
Handset ............................................................................ 13
5. DIAGRAMS
5-1. Block Diagram – BASE UNIT Section –...................... 17
5-2. Block Diagram – HANDSET Section –........................ 18
5-3. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 19
5-4. Printed Wiring Board – BASE RF Section – ................ 20
5-5. Schematic Diagram – BASE RF Section – ................... 21
5-6. Printed Wiring Board – BASE MAIN Section –........... 22
5-7. Schematic Diagram – BASE MAIN Section – ............. 23
5-8. Printed Wiring Board – HAND RF Section –............... 24
5-9. Schematic Diagram – HAND RF Section – .................. 25
5-10. Printed Wiring Board – HAND MAIN Section – ........ 26
5-11. Schematic Diagram – HAND MAIN Section – ............ 27
5-12. IC Pin Function Description ........................................... 29
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be damaged by heat.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED
LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANU AL OR IN SUPPLEMENTS PUBLISHED BY SONY.
6. EXPLODED VIEWS ................................................ 31
7. ELECTRICAL PARTS LIST ............................... 33
2
SECTION 1
GENERAL
This section is extracted from
instruction manual.
3
4
SECTION 2
d
)
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
HAND CABINET (REAR)
5
Remove the hand cabinet (rear)
to direction of the arrow B.
4
claw
3
two claws
B
3
two claws
2
two screws
(BTP2.6 × 12)
A
1
Remove the battery case li
to direction of the arrow A.
HAND MAIN BOARD
6
antenna cover
2
screw
(BTP2.6
×
8)
1
C
vol knob (U)
2
four screws
(BTP2.6
×
8)
5
Remove the hand main board
to direction of the arrow
3
two screws
(BTP2
4
two charge terminals (U
C
.
×
6)
5
BASE CABINET
2
claw
2
claw
1
four screws
(BTP2.6
×
10)
3
cabinet (lower)
BASE MAIN BOARD
3
cabinet (upper)
2
two charge
springs (U)
1
two screws
(BTP2.6
6
base main board
4
four screws
(BTP2.6
×
8)
×
8)
5
washer (SP)
7
harness
6
SECTION 3
TEST MODE
BASE UNIT
[Setting the Test Mode]
1. Power on with pressing the [HANDSET LOCATOR] key for two seconds.
2. CHARGE and LINE LEDs turn on for 50 msec, and the test mode is set.
* If setting the test mode with the status that [TONE] position is selected at [DIAL MODE] switch, the unit cold stars next time when the
power is turned on.
[Releasing the Test Mode]
To release the test mode, perform as follows:
• Turn the power off (disconnect the AC adapter plug).
• Set the handset to charge on the base unit (except Test Mode 9).
• Bell in.
[Changing the Test Mode Step]
1. Set the [DIAL MODE] switch to the [PULSE] position.
2. Press the [HANDSET LOCATOR] key.
3. A step is changed each time the key is pressed, and CHARGE and LINE LEDs turn on for 50 msec.
[Changing the Channel]
1. Set the [DIAL MODE] switch to the [TONE] position.
2. Press the [HANDSET LOCATOR] key.
3. A channel is changed each time the key is pressed, and CHARGE and LINE LEDs turn on for 50 msec.
* Channel will be back to initial channel (19CH), when the test mode step is changed.
• Channel Rotation
21CH 40CH 1CH 2CH 3CH 39CH 40CH20CH19CH
. . .
7
[Test Mode Execution]
Press the [HANDSET LOCATOR] key to execute any of the following tests:
Step
1 VCO/TX FREQ. ADJ L L L L
2 TX MOD CHECK L H L H
3 TX DATA L L L L *1
4 RX SENS H L H H
5 SQ SENS L L *A H
6 DTMF SINGLE TONE H L L H *2
7 DTMF DUAL TONE H L L H *3
8 DATA IN CHECK L L L L *4
9 CHARGE CHECK H L L L *5
10 DUPLEX L H H H
Test Mode
Name
Remarks
TALK (IC5 pin qd)
RX MUTE (IC5 pin eh)
TX MUTE (IC5 pin ej)
TX (IC5 pin rh)
* Initial Channel of each step: 19CH
*A. SQ on: H (CHARGE LED turns on)
SQ off: L (CHARGE LED turns off)
*1. Test Mode 3: Continue output TX data as “ 0000……”.
*2. Test Mode 6: Set the
[DIAL MODE] switch to the [TONE] position, and press the [HANDSET LOCATOR] key.
DTMF will be changed.
ROW 1 → ROW 2 → ROW 3 → ROW 4 → COL1 → COL2 → COL3 → ROW1 → …… .
*DTMF frequency
ROW 1: 696.95 Hz COL1: 1209.31 Hz
ROW 2: 770.13 Hz COL2: 1335.65 Hz
ROW 3: 852.27 Hz COL3: 1476.71 Hz
ROW 4: 940.99 Hz
*3. Test Mode 7: Set the [DIAL MODE] switch to the [TONE] position, and press the [HANDSET LOCATOR] key.
DTMF will be changed.
1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 → 9 → 0 → → # → 1 → …… .
*
*4. Test Mode 8: When locked receiving data is “ 0000……”, CHARGE LED turns on.
*5. Test Mode 9: When CHGIN (IC5 pin eg) is “ L” (charge on), CHARGE LED turns on.
8
HANDSET
[Setting the Test Mode]
1. Power on with press the [*] key and the [#] key simultaneously for one second.
2. It beeps confirm tone, and the test mode is set.
* If the [PGM] key is pressed, the unit cold starts next time when the power is turned on.
[Releasing the Test Mode]
To release the test mode, perform as follows:
• Press the [FLASH, TALK] key.
• Turn the power off (remove the battery pack).
• Set the handset to charge on the base unit (except Test Mode 9).
[Changing the Test Mode Step]
Press the each key of the test mode step number.
[Changing the Channel]
Press the [CHANNEL] key.
* The channel is back to initial channel (6CH), when test mode step is changed.
• Channel Rotation
19CH 40CH 1CH 2CH 3CH 39CH 40CH20CH21CH
[Test Mode Execution]
Press the each key for the desired test mode step to execute any of the following tests:
No.
1 VCO/TX FREQ. ADJ 1 L H L L L
2 TX MOD CHECK 2 L H H L H
3 TX DATA 3 L H L L H *1
4 RX SENS 4 H H L H H *2
5 SQ SENS 5 L H L *A H
6 RECEIVE DATA CHECK 6 L H L L H *3
7 BELL CHECK 7 H L L L H
8 BAT. LOW CHECK 8 H L L L H *4
9 CHARGE CHECK 9 H L L L H *5
10 DUPLEX 0 L H H H L *2
Test Mode
Name
KEY
RX PWR (IC404 pin qd)
TX B (IC404 pin rs)
TX MUTE (IC404 pin qa)
CONV (IC404 pin ej)
RX MUTE (IC404 pin qs)
* Initial Channel of each step: 21CH
. . .
Remarks
*A. SQ on: H
SQ off: L
*1. Test Mode 3: Continue output TX data as “ 0000……”.
*2. Test Mode 4, 10: It is possible to change the speaker output level by [VOL] switch.
*3. Test Mode 6: When locked receiving data is “ 0000……”, it beeps confirm tone. (1 kHz)
*4. Test Mode 8: When BATT LOW (IC404 pin eg) is “ L” (battery low), it beeps confirm tone.
*5. Test Mode 9: When CHG IN (IC404 pin eh) is “ L” (charge on), it beeps confirm tone.
9
SECTION 4
+
–
deviation meter
TP (ANT)
TP (GND)
ELECTRICAL ADJUSTMENTS
0 dBm = 0.775 V
BASE UNIT
• Make the set in test mode. (See page 7.)
– TX Adjustments and Checks –
1. TX VCO Check
Setting:
digital voltmeter
+
–
Procedure:
1. Connect a digital voltmeter to TP (TX VCO), TP (RX VCO)
and TP (GND) on the BASE RF board.
2. Check that both TP (TX VCO) and TP (RX VCO) voltage of
digital voltmeter are 0.8 V to 2.2 V.
3. Set the
[DIAL MODE] switch (S2) to the [TONE] position.
4. Press the [HANDSET LOCATOR] key (S1) three times to change
the channel to 40CH.
5. Check that both TP (TX VCO) and TP (RX VCO) voltage of
digital voltmeter are 0.8 V to 2.2 V.
6. Press the [HANDSET LOCATOR] key (S1) once to change
the channel to 1CH.
7. Check that both TP (TX VCO) and TP (RX VCO) voltage of
digital voltmeter are 0.8 V to 2.2 V.
TP (TX VCO), TP (RX VCO)
TP (GND)
7. Check that the value of power meter is –5.5 dBm ± 1.5 dBm.
4. Modulation Sensitivity Adjustment
Setting:
AF OSC
600
+
–
1 kHz, –20 dBm
Ω
LINE jack (J1)
Procedure:
1. Connect an AF OSC to the LINE jack (J1) on the B ASE MAIN
board.
2. Connect a de viation meter to TP (ANT) and TP (GND) on the
BASE MAIN board.
3. Set the [DIAL MODE] switch (S2) to the [PULSE] position.
4. Press the [HANDSET LOCATOR] key (S1) once to change
the test mode step to TX MOD CHECK.
5. Adjust RT3 on the BASE MAIN board so that the value of
deviation meter becomes 8 kHz ± 0.5 kHz.
5. Distortion and S/N Ratio Check
Setting:
2. TX Frequency Adjustment
Setting:
frequency counter
+
–
TP (ANT)
TP (GND)
Procedure:
1. Connect a frequency counter to TP (ANT) and TP (GND) on
the BASE MAIN board.
2. Restart the test mode to change the channel to 19CH.
3. Adjust CT1 on the BASE MAIN board so that the value of
frequency counter becomes 926.897468 MHz ± 600 Hz.
3. TX Power Adjustment
Setting:
power meter
+
–
TP (ANT)
TP (GND)
Procedure:
1. Connect a power meter to TP (ANT) and TP (GND) on the
BASE MAIN board.
2. Adjust R T301 on the B ASE RF board so that the value of pow er
meter becomes –5.5 dBm ± 1 dBm.
3. Set the
[DIAL MODE] switch (S2) to the [TONE] position.
4. Press the [HANDSET LOCATOR] key (S1) three times to change
the channel to 40CH.
5. Check that the value of power meter is –5.5 dBm ± 1.5 dBm.
6. Press the [HANDSET LOCATOR] key (S1) once to change
the channel to 1CH.
AF OSC
600
+
–
1 kHz, –20 dBm
distortion meter
noise meter
CCITT: on
Ω
LINE jack (J1)
+
–
+
–
TP (ANT)
TP (GND)
Procedure:
1. Connect a distortion meter and noise meter to TP (ANT) and
TP (GND) on the BASE MAIN board.
2. Check that the value of distortion meter is less than 4%.
3. Check that the value of noise meter, and record it.
4. Stop outputting the signal of AF OSC.
5. Check that the v alue of noise meter again. And check that difference of level between in step3 and in step5 is less than
30 dB.
10
6. Code Deviation Check
600
Ω
+
–
SINAD meter
LINE jack (J1)
Setting:
deviation meter
+
–
TP (ANT)
TP (GND)
Procedure:
1. Connect a de viation meter to TP (ANT) and TP (GND) on the
BASE MAIN board.
2. Press the [HANDSET LOCATOR] key (S1) once to change
the test mode step to TX DATA.
3. Check that the value of deviation meter is 6 kHz to 10 kHz.
– RX Adjustments and Checks –
1. DISCRI Volta ge Adjustment
Setting:
SSG
TP (ANT)
Carrier frequency: 902.952467 MHz
Modulation: no modulation
Output level: – 47 dBm
digital voltmeter
TP (GND)
Procedure:
1. Change the modulation of SSG to 1 kHz, ± 8 kHz deviation.
2. Connect a noise meter to the LINE jack (J1) on the BASE
MAIN board.
3. Adjust RT2 on the BASE MAIN board so that the value of
noise meter becomes 265 mV ± 10 mV.
3. Distortion and S/N Ratio Check
Setting:
SSG
TP (ANT)
Carrier frequency: 902.952467 MHz
Modulation: 1 kHz,
Output level: – 47 dBm
distortion meter
±
8 kHz deviation
+
–
noise meter
+
–
CCITT: on
600
TP (GND)
Ω
LINE jack (J1)
+
–
TP (DISCRI)
TP (GND)
Procedure:
1. Connect a SSG to TP (ANT) and TP (GND) on the BASE
MAIN board.
2. Connect a digital v oltmeter to TP (DISCRI) and TP (GND) on
the BASE MAIN board.
3. Set the
[DIAL MODE] switch (S2) to the [PULSE] position.
4. Press the [HANDSET LOCATOR] key (S1) three times to change
the test mode step to RX SENS.
5. Adjust L3 on the B ASE MAIN board so tha t the value of digital voltmeter becomes 1 V ± 0.05 V.
2. TEL Out Level Adjustment
Setting:
SSG
TP (ANT)
Carrier frequency: 902.952467 MHz
Modulation: 1 kHz,
Output level: – 47 dBm
±
8 kHz deviation
TP (GND)
Procedure:
1. Connect a distortion meter to the LINE jack (J1) on the B ASE
MAIN board.
2. Set the CCITT of noise meter on.
3. Check that the value of distortion meter is less than 4%.
4. Check that the value of noise meter, and record it.
5. Change the modulation of SSG to no modulation.
6. Check that the v alue of noise meter again. And check that difference of level between in step3 and in step5 is more than
60 dB.
4. RX Sensitivity Check
Setting:
SSG
TP (ANT)
Carrier frequency: 902.952467 MHz
Modulation: 1 kHz,
Output level: –111 dBm
±
8 kHz deviation
TP (GND)
noise meter
+
–
600
Ω
LINE jack (J1)
Procedure:
1. Connect a SINAD meter to the LINE jack (J1) on the BASE
MAIN board.
2. Change the output level of SSG to –111 dBm, and change the
modulation to 1 kHz ± 8 kHz devition.
3. Check that the value of SINAD meter is more than 12 dB.
11
5. SQ Sensitivity Adjustment
Setting:
6. DTMF Level Check
Setting:
SSG
Carrier frequency: 902.952467 MHz
Modulation: 1 kHz, ±8 kHz deviation
Output level: –113 dBm
TP (ANT)
TP (GND)
noise meter
+
–
600
Ω
LINE jack (J1)
Procedure:
1. Connect a noise meter to the LINE jack (J1) on the BASE
Procedure:
1. Change the output level of SSG to –113 dBm.
2. Press the [HANDSET LOCATOR] key (S1) once to change
the test mode step to SQ SENS.
MAIN board.
2. Press the [HANDSET LOCATOR] key (S1) twice to change
the test mode step to DTMF DUAL TONE.
3. Check that the value of noise meter is –5 dBm to 0 dBm.
3. Adjust RT1 so that the CHARGE LED (D6) becomes blinking.
Adjustment Location:
– BASE MAIN BOARD (Component Side) – – BASE MAIN BOARD (Conductor Side) –
J1
TP(ANT)
BASE RF Board BASE RF Board
RT301
TX Power Adjustment
TP(GND)
TP(RX VCO)
Modulation Sensitivity
RT3
Adjustment
CT1
TX Frequency Adjustment
L3
DISCRI Voltage Adjustment
RT2
TEL Out Level Adjustment
RT1
SQ Sensitivity Adjustment
TP(TX VCO)
TP(DISCRI)
TONE PULSE
S2
12
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